HA of Database Control for RAC made easy

When you install an 11g RAC database without Grid Control respectively Cloud Control present, this is what the DBCA will give you:

There is one Database Control OC4J Container only, running on host01. Should host01 go down, the Enterprise Manager is no longer available now. We could make that a resource, known to the clusterware and let it failover in that case. But also – and even easier – we can start a second OC4J Container to run on host02 simultaneously like this:

All this is of course not new, but you won’t find it easy in the docs. That is something from my RAC accelerated course last week in Reading, by the way. Even seasoned RAC DBAs are sometimes not aware of that option, so I thought it might be helpful to publish it here briefly :-)